Heller's Revenge by JD Nixon

Book 2 in the Heller series. Tilly Chalmers’ sexy boss, Heller, has a talent for making enemies. Not a forgive-and-forget kind of man, he has a few scores to settle - including one with Tilly’s brother. Tilly is kept busy juggling that constant worry with managing three new assignments as a rookie security officer - crowd control at a lingerie parade, babysitting an immature, sex-starved IT billionaire, and an unusual and emotional job with a famous environmental activist. But as usual, Tilly’s assignments don’t go quite to plan. All this, as well as trying to keep her vow not to sleep with her beautiful and enigmatic boss, no matter how much of a temptation he proves.